#550 Review#1 fixes. Cache in memory db queries

shopelectro/views/catalog.py

@@ -1,5 +1,5 @@
 import typing
-from functools import partial
+from functools import lru_cache, partial
 
 from django import http
 from django.db.models import QuerySet
@@ -159,6 +159,7 @@ def get_context_data(self, **kwargs):
         }
 
 
+@lru_cache(maxsize=64)
 def merge_products_context(products):
     images = Image.objects.get_main_images_by_pages(
         models.ProductPage.objects.filter(shopelectro_product__in=products)
@@ -212,12 +213,17 @@ class TaggedCategoryPage(CategoryPage):
     def get_sorting_index(self):
         return int(self.kwargs.get('sorting', 0))
 
-    def get_tags(self) -> typing.Union[models.TagQuerySet, None]:
-        tags = self.kwargs.get('tags')
-        if not tags:
+    def get_tags(self) -> typing.Optional[models.TagQuerySet]:
+
+        @lru_cache(maxsize=64)
+        def get_tags(request_tags_: str):
+            slugs = models.Tag.parse_url_tags(request_tags_)
+            return models.Tag.objects.filter(slug__in=slugs)
+
+        request_tags = self.kwargs.get('tags')
+        if not request_tags:
             return None
-        slugs = models.Tag.parse_url_tags(tags)
-        return models.Tag.objects.filter(slug__in=slugs)
+        return get_tags(request_tags)
 
     def get_products(self):
         products = super().get_products()